Valve mechanism for two-cycle gas-engines.



W. H. HUNT.

VALVE MECHANISM FOR TWO-CYCLE GAS ENGINES.

APPLICATION FILED 050.13. ms.

Patented Jan. 21, 1919.

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WILLIAM H. HUNT, OF NATIONAL CITY, CALIFORNIA.

VALVE MECHANISM FOR TWO-CYCLE GAS-ENGINES.

Application filed December 13, 1915.

To all whom it may concern:

Be it known'that I, WILLIAM H. IIU'NT, a citizen of the United States, residing at National City, in the county of San Diego and State of California, have invented certain new and useful Improvements in Valve Mechanism for, Two-Cycle Gas-Engines, of which the following is a specification.

My invention relates to valve mechanism for two-cycle gas engines, and the objects of my invention are: first, to provide an inlet valve mechanism that will control the new charge of gas entering the cylinder through the inlet port in such a way that intermingling of the new and old-charge will be reduced to a minimum; second, to provide a valve mechanism of this class which will hold back the new charge of gas until the piston has uncovered a large portion of the inlet port, then open suddenly and let the new charge in in a body, displacing the old charge instead of letting it start its flow with a thin jet and mingle with the old as it would if the piston controlled the time the new charge was admitted; third, to combine a valve mechanism of this class with the inlet port of a two-cycle gas engine which combination tends to prevent the intermingling of the new charge with theold, thus greatly increasing the efficiency of the engine; fourth, to provide a valve mechanism of this class with ports formed in such a way as to prevent the intermingling of the new charge with the old; fifth, to provide combined intake and exhaust valve mechanism which provides ready exit of the old charge of gas and prevents thev intermingling of the new charge with the old, thus greatly increasing the efliciency of the engine, and sixth, to provide a valve mechanism of this class for two-cycle gas engines that is simple. economical of construction, durable, and will not readily get out of order.

With these and other objects in view as will appear hereinafter, my invention consists of certain novel features of construction, combination and arrangement of parts as will be hereinfter described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawings and to the characters of reference thereon which form a part of this specification, in which:

Figure 1 is a longitudinal sectional view of a two-cycle gas engine showing my valves in operative connection therewith. Fig. 2 is Specification of Letters Patent.

Patented Jan. 21, 1919.

Serial No. 66,428.

a fragmentary sectional view, at right angles thereto taken through c/'' of Fig. 1. Fig. 3 is a sectional view through a-b of Fig. 2, and Fig. 4 is a sectional view through cd of Fig. 2.

Similar characters of reference refer to similar parts throughout the several views.

The crank case 1, cylinder 2, piston 3, inner lining 4, valve supporting nut 5, shaft 6, connecting rod 7 cam 8, rocker arm 9, inlet valve 10, cylinder head 11, exhaust valve 12, rocker arm 13, exhaust valve rod 14, and cam 15, constitute the principal parts of my valve mechanism.

The crank case 1 is of the ordinary or conventionaltype in which the gas is compressed in said crank case and on one side is provided a lug 1, adapted for a guide for the exhaust valve rod 14. The cylinder 2 as here shown is a two-diameter cylinder. The upper portion is double-walled provided with a water jacket between the two walls, and the inner wall extends outwardly and connects with the outer wall at 2 on an angle near the inward end of the piston when said piston is at the outward end of its stroke. Mounted tightly in the lower end of this cylinder is the inner lining 4 which is spool-shaped, the flange 4 being provided with a plurality of perforations as shown best in Fig. 3 ofthe drawing, and the flange 4 is provided with a plurality of perfora tions as shown best in Fig. 40f the drawing. The inner surface of this inner lining 4 is adapted to fit the outer surface of the piston 3 and is the same diameter as the inner surface of the inner wall of the upper end of the cylinder 2. The surface between the cylinder 2 near the lower end and the cylinder wall of the inner lining 4 is for the passage of the gas from the crank case to the cylinder and it passes through the ports 4 and through the perforations 4 which intermingles the same and it strikes against the angle portion 2 of the inner cylinder wall and is conducted to the inner portion of the cylinder in volume. lower surface of the flange 4 is an annular valve 10 which is provided with a plurality of perforations as'shown in Fig. 4 of the drawings. This valve is revolubly mounted around the lower end of this inner lining 4, and is held in position by the nut 5 and when revolved slightly in opposite directions opens and closes the ports 4. This valve is for the purpose. of holding the gas Mounted against the in the crank case until the piston has nearly reached the end of its outer strokeand has opened the port 2 between the end of the piston and the inner wall of the cylinder 2 so that the gas when released by the valve 10 rushes in a body into the cylinder through the ports 2. This valve 10 is actuated by means of the rocker arm 9 which is pivotally mounted on the bolt. 9*, screwed into the side of the crank case and its other end engages with the cam 8 which is'rigidly secured to the shaft 6 between the crank arm and the casing wall. The lower end of this rocker arm 9 is held in position against the cam 8 by means of the spring 10 which is secured to the crank case at one end and its other end is secured to one of the lugs 10- between which. the upper end of the rocker arm is inserted. In the upper end of the cylinder 2 is: mounted a cylinder head 11, the wall of said cylinder head extending down into: said cylinder, andv spaced apart from the inner surface of said cylinder a1"- lowing for the reciprocation of the sleeve valve 12 which is: provided with a packing ring'12 in its outer surface,- and said cylinder head is provided with packing rings 11 to prevent leakage between the inner surface of said sleeve and said cylinder head. This sleeve is provided with a recess 12 in its outer surface in which is mounted the spring 12 which. tends to hold the sleeve outwardly'in said: cylinder, the one end of said spring engaging with a shoulder 2?. This sleeve valve is adapted to move up and down soasto open and close the exhaust ports 2 oppositely disposed in the wallv of said cylinder.v Said sleeve 12 is provided with oppositely disposed lugs 12 which protrude up through the cylinder head, and between said lugs is' pivotally mounted one end of'the rocker arm 13 which is pivoted intermediate: its. ends upon lug 11". Upon the outwardly extending end of said rocker arm is pivotally mounted the valveoperating rod 14 which extends downwardly and is guided by means of lug 1 and on its lower end is. provided: a roller 14* which engages with a cam 15 secured to the main shaft 6 so that. when said main shaft revolves the sleeve valve 12 is reciprocated on and. off: of theexhaust ports 2 in' said cylinder;

Though I have shown and described a particular construction, combination and a1"- rangement' of." parts-,1 do not wish to be" limited' to this particular. construction, combination and arrangement, but desire to include in the. purview of my invention the construction, combination and? arrangement substantially as: set forth intlie appended claims. I It" is obvious that. with this construction there is providedian intake valvezmechanism for. twoscyclez gas; engines, that will; permit a volume of new gas to enter the cylinder ina body thus reducing. the liability of the mixing of the old and new chargeto a minimum, that the combination of the intake valve by-pass deflector and exhaust valve provide a very efficient valve mechanism for two-cycle gas engines, that the gas will be held in the crank case until the piston is near the end of its outward stroke, and then a large volume of the new gas will be released into the cylinder without any obstructions, that the device is simple, eco pomical of construction, durable, and noiseess.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is:

1. In a valve mechanism for two-cycle gas engines,a port'encircling the cylinder positioned at the end of the outward stroke of the piston, a channel encircling said cylinder communicating with said port provided with an inclined upper wall for conducting the gas properly intothe cylinder, a bypass communicating with said channel and a valve timing the flow of gas through said bypass to said channel and port.

2; In a valve mechanism fortwo-cycle gas engines, a port encircling the cylinder positioned at the end of the outward stroke of the piston, a: channel encircling said: cylinder communicating'with said port provided with a perforated lower wall for properly. distributing thegas to said channel and port, a bypass communicating with the perforations in said lower wall and a valve timing the flow of gas through said bypass and said perforations to saidchannel and port.-

3. In a valve mechanism for two-cycle gas engines, a port encircling the cylinder positioned at the end of the outward stroke of the piston, a channel encircling said cylinder communicating with said port provided with a perforated lower wall and an inclined upper wall for conducting the gas properly into the cylinder, a bypass communicating with the perforations: in said lower wall and a valve timing. the flow of gas through said bypass and said perforations to said channel and port whereby the gas will not bepermitted to enter said bypass until the piston has opened said port.

4'. In avalvemechanism for two-cycle gas engines, a port encirclingthe cylinder positioned at the end of the outward stroke. of the piston, a channel encirclingsaid cylinder communicatingwith said portp'roivided with a perforated lower wall and an inclined' upper wall for conducting the gas properly into the cylinder, a bypass co1nmunieatingwith the perforations in" said lower wall and a valve positioned: at the. outer endiof. said bypass for timing the-flow of gas through; saidtbypass: and; said: perrxforation's to: said channel. and; port? wherebythe gas willnot be permitted to enter said bypass until the piston has opened said port.

5. In a valve mechanism for two-cycle gas engines, an inlet port encircling the cylinder, a channel encircling said cylinder communicating with said port provided with a perforated lower wall and with an inclined upper wall for conducting the gas properly into the cylinder.

6. In a valve mechanism for two-cycle gas engines, a port positioned at the end of the outward stroke of the piston encircling the cylinder, a channel encircling said cylinder communicating with said port, provided with a lower perforated wall and with an inclined upper wall for conducting the gas properly into the cylinder.

7 In a valve mechanism for two-cycle gas engines, an inlet port encircling the cylinder, a channel encircling said cylinder communicating with said port, provided with a perforated lower wall for properly distributing the gas to said channel and port.

8. In a valve mechanism for two-cycle gas engines, an inlet port encircling the cylincler, a channel encircling said cylinder communicating with said port provided with an inclined upper wall for conducting the gas properly into the cylinder.

In testimony whereof I have hereunto set my hand at San Diego, California, this 7th day of December, 1915.

WILLIAM H. HUNT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

